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Show Table 9- 2 CURRENT AND PROJECTED PUBLIC WATER SUPPLY BY SOURCE Jordan River Basin SOURCE Currently Developed ( 1995) Projected Development ( 2020) Average Reliable3 Average Reliable3 ( acre - feet) City Creek 8,310 6,080 8,310 6,080 Parley's Creek 8,890 5,210 12,310 8,630 Big Cottonwood Creek 25,920 20,020 30,300 22,340 Little Cottonwood Creek 21,670 17,340 37,500 23,700 Small Mountain Streams 3,400 1,100 3,400 1,100 Welby- Jacob Exchange 29,400 17,500 21,500b 9,600b Central Utah Project 70,000 84,000c 70,000 84,000c Deer Creek Reservoir 61,700 61,700 61,700 61,700 Groundwater 114,400 114,400 125,410 125,410 Groundwater Recharge 5,800 1,060 5,800 1,060 TOTAL 349,490 328,410 376,230 343,620 a: Reliable nine out of 10 years b: Excludes 7,900 acre- feet of yield that may be dedicated to the CUP Bonneville Unit water supply. c: The Central Utah Project is managed to bring 84,000 acre- feet into the basin during times of drought. A number of assumptions were made in the creation of the Wasatch Front Water Demand/ Supply Model. They are: ° All existing developed water supplies will continue to be available for use in Salt Lake County. ° Municipal & industrial water supplies will be shared by all users in Salt Lake County. ° The Central Utah Project will be completed and deliver 50,000 acre- feet to the Salt Lake County Water Conservancy District and 20,000 acre- feet to the Metropolitan Water District of Salt Lake City. ° An additional 10,000 acre- feet of groundwater will be developed by the Salt Lake County Water Conservancy District. This will bring the groundwater development close to its safe yield for the valley ( See Section 19, Groundwater). Also assumes 5,400 acre- feet will be developed by artificial groundwater recharge For all surface streams in Salt Lake County, it is assumed that up to 90 percent of the flow will be diverted as needed. City Creek, Parley's Creek, Little Cottonwood and Big Cottonwood water treatment plants will be enlarged. Little Dell Reservoir water will be treated and used at the expanded Parley's Creek water treatment plant. Water conservation measures were not included in the initial running of the model and the projecting of future water needs. This created a base line from which the impacts of the various conservation measures could best be evaluated. The model was then run including the various conservation measures. The projected effects of water conservation are expected to reduce the projected water use by about 11.4 percent ( 47,700 acre- feet) by the year 2020. Water conservation is discussed in Section 17. 9- 4 |